EP2824366B1 - Electric motor - Google Patents

Electric motor Download PDF

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Publication number
EP2824366B1
EP2824366B1 EP14176623.8A EP14176623A EP2824366B1 EP 2824366 B1 EP2824366 B1 EP 2824366B1 EP 14176623 A EP14176623 A EP 14176623A EP 2824366 B1 EP2824366 B1 EP 2824366B1
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EP
European Patent Office
Prior art keywords
shaft
motor according
stator
nut
bearing
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EP14176623.8A
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German (de)
French (fr)
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EP2824366A1 (en
Inventor
Christian Mounier
Georges Rozek
Jérémy Chamand
Haikel GHERAIRI
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Moteurs Leroy Somer SA
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Moteurs Leroy Somer SA
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Publication of EP2824366A1 publication Critical patent/EP2824366A1/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/08—Structural association with bearings
    • H02K7/081—Structural association with bearings specially adapted for worm gear drives

Definitions

  • the present invention relates to electric motors and more particularly but not exclusively those intended for the production of actuators, in particular for robotic arms.
  • the Applicant has proposed, in the past, an electric motor whose shaft is made in two parts assembled with each other by screwing, namely a front portion on which is formed an external helical thread which cooperates with a wheel toothed to realize the actuator, and a rear portion internal to the motor housing.
  • the front portion is guided in rotation by two angular contact bearings axially locked between a shoulder of the front portion of the shaft and the rear portion of the shaft.
  • the latter is guided in rotation by a rear bearing.
  • a brake acts on the rear part of the tree.
  • a lip seal is disposed within the engine, being carried by a forward flange which also holds the angular contact bearings. This lip seal is applied to the rear part of the shaft.
  • a wiper seal is present at the front of the engine, and defines with the lip seal a space containing a lubricant of the front bearings.
  • the patent application EP 1 437 819 discloses an electric motor having a monolithic shaft and permanent magnets rotating with the shaft and mechanically interacting with a stator.
  • the magnets are carried by the nut.
  • the nut engages a threaded internal portion of the shaft, which is located on the rear side of the stator, which allows the nut to be applied to exert a tensile stress on the shaft on a portion of relatively long length, extending from the aforementioned shoulder to the rear of the stator.
  • the shaft portion under traction is confined to that in contact with the front bearings.
  • a longer shaft length under tension makes it possible to stiffen the latter over a greater distance, and thus to further improve the engine performance and in particular the alignment and rotation accuracy, and to eliminate the risk of loosening. of the nut.
  • the threaded portion above preferably extends, along the axis of the shaft, from a front end positioned at the rear half of the stator.
  • the threaded portion extends axially advantageously behind the stator.
  • the engine may have two front guide bearings between the shoulder and the nut. This or these front bearings may each be in oblique contact, the front bearing or bearings being preferably sealed and greased.
  • the use of sealed and greased bearings makes it possible to avoid the use of a lip seal behind the at least one front bearing, and to eliminate the corresponding friction.
  • this can make it possible to make the nut with a thickness which corresponds substantially to that of the radially inner ring of the front bearing in contact with it, in particular with a thickness equal to that of the ring at ⁇ 20%. Too strong contact pressure against this radially inner ring is thus avoided.
  • the electric motor may comprise a monobloc housing which houses the stator and a brake, this housing being preferably cylindrical of revolution.
  • the front flange can be attached to this housing, as well as a rear flange that supports the rear bearing.
  • the stator preferably comprises a piece of injected thermoplastic material, serving as a support for at least one thermal sensor.
  • This support piece may be arranged to cap the coil heads of the stator at one end, preferably its rear end.
  • the support member preferably has an annular shape, with concentrically radially inner and outer tubular skirts, connected by an intermediate wall. perforated, the openings allow the passage of the son or sensors and passes a coating resin of the stator.
  • the stator may include end insulators behind which the radially inner skirt slides, when mounting the support part in the motor housing.
  • the support member comprises at least one sensor holding tab, molded with at least one of the intermediate wall and the inner and outer skirts.
  • This tab can be elastically deformable, so as to exert a slight pressure on the sensor waiting for coating by the resin of the stator.
  • the sensor is preferably a thermocouple.
  • the shaft can be made with an external helical thread.
  • the shaft may have a substantially constant diameter between the shoulder which serves to abut the (x) bearing (s) before and the threaded portion on which the nut engages.
  • the engine 1 according to the invention represented on the figure 1 , has a shaft 2 rotating about an axis X.
  • the shaft 2 is preferably metal and machined from a single block, steel for example.
  • the shaft 2 externally has a drive means, such as for example, as illustrated, an external helical thread 3, which can engage with a toothed wheel not shown, the motor 1 belonging for example to an actuator of a robotic arm.
  • a drive means such as for example, as illustrated, an external helical thread 3, which can engage with a toothed wheel not shown, the motor 1 belonging for example to an actuator of a robotic arm.
  • the helical thread 3 may have been machined in the mass, as illustrated.
  • the shaft 2 is guided in its rotation, at the front, by two bearings 4, preferably with oblique contacts, as illustrated, arranged one behind the other, and at the rear by a rear bearing 5.
  • the bearings 4 and 5 are known in themselves, and are sealed and greased, having sealing discs 6 which contain the lubricant between the rings in contact with which the rolling elements 7 move.
  • the front bearings 4 are carried by a front flange 10 which also houses a scraper seal 11 applying on the shaft 2.
  • the radially outer rings 13 of the front bearings 4 are locked axially on the flange between a front wall thereof and by a circlip 12.
  • the radially inner rings 79 are locked axially forwardly by a shoulder 16 of the shaft 2 .
  • the flange 10 is assembled to a casing 14, cylindrical axis X, which houses a stator 15 and a brake 16 lack of current, known in itself, having a movable armature 17, recalled in the braking position against a gasket brake of a brake disc by one or more springs not shown.
  • a solenoid 27 removes, when fed, the frame 17 of the brake lining 26 against the action of the spring or springs.
  • the housing 14 is closed at the rear by a rear flange 18 which carries the rear bearing 5, and on which can be fixed, as illustrated, an encoder 19 known in itself, this encoder comprising a fixed portion 20 fixed to the screw aid 21 on the flange 18 and a movable part fixed on the shaft 2 by means of a screw 22.
  • the rotor comprises permanent magnets 25 which interact magnetically with the stator 15, so as to generate the motor torque.
  • magnets 25 are carried in the example in question by a nut 30 which is screwed onto a threaded portion 32 of the shaft 2.
  • the threaded portion 32 is located on the rear side of the stator 15, and extends for example, as illustrated, axially along the X axis from a front end 32a located at the rear half 15a of the stator 15.
  • rear end 32b of the threaded portion is located behind the stator 15.
  • the latter is of length L.
  • the front end 32a may be located substantially at a shoulder 48 of the nut 30, against which the magnets 25 abut by their rear end.
  • the brake disc 26 is carried by a hub 53 which bears at its front end 53a against the rear end of the nut 30 and at its rear end 53b against the radially inner ring 38 of the rear bearing 5.
  • a washer 39, elastically deformable, preload rear bearing 5, is interposed axially between the rear bearing 5 and the rear flange 18.
  • the rear bearing 5 can move back towards the rear flange 18, the shaft being without axial clearance with respect to the front flange 10 due to the presence of the front bearings 4 with oblique contacts.
  • the nut 30 abuts axially, at the front, by one end 35, against the radially inner ring 79 of the second front bearing 4.
  • the stator 15 comprises a support piece 60, represented more particularly in FIG. figure 2 , injected thermoplastic material, which maintains at least one temperature sensor 80 of the stator.
  • the support piece 60 comprises a radially outer tubular skirt 91 and a radially inner skirt 92, concentric with an X axis, interconnected by an intermediate wall 93 extending perpendicularly to the axis X.
  • the intermediate wall 93 has openings 94.
  • a tab 95 for holding the sensor 80 is molded with the intermediate wall 93.
  • the stator 15 comprises unrepresented coils and end insulators.
  • the inner skirt 92 is placed behind these end insulators, while the outer skirt 91 faces the radially inner surface of the casing 14.
  • a resin 96 coats the stator winding and the support piece 60, in favor of the openings. 94 of this one.
  • the nut 30 has blind holes 50 at its rear end.
  • the variant of the figure 3 differs from that of figure 1 in that the nut 30 no longer carries the magnets 25, these being carried by a hub 110 attached to the shaft 2.
  • the threaded portion 32 extends between the second front bearing 4 and the stator 15.
  • the nut 30 is located at the front of the engine, at an opening 116 of the front flange 10.
  • the threaded portion 32 extends forward of the front bearing 4, in the opening 116.
  • the magnets 25 are worn directly by the tree 2.
  • the variant of the figure 5 differs from that of figure 4 in that the front flange 10 extends forwardly beyond the nut 30 and in that the brake is no longer carried by the casing 14 but by the rear flange 18.
  • front bearing or bearings may be other than those described, as well as the rear bearing.

Description

La présente invention concerne les moteurs électriques et plus particulièrement mais non exclusivement ceux destinés à la réalisation d'actionneurs, notamment pour des bras robotisés.The present invention relates to electric motors and more particularly but not exclusively those intended for the production of actuators, in particular for robotic arms.

Ces moteurs sont soumis, lors de leur fonctionnement, à des charges qui s'exercent sur l'arbre de façon alternée et la rotation de l'arbre doit s'effectuer sans jeu axial, avec précision.These motors are subjected, during their operation, to loads that are exerted on the shaft alternately and the rotation of the shaft must be performed without axial play, with precision.

La demanderesse a proposé, par le passé, un moteur électrique dont l'arbre est réalisé en deux parties assemblées l'une avec l'autre par vissage, à savoir une partie avant sur laquelle est réalisé un filet hélicoïdal externe qui coopère avec une roue dentée pour réaliser l'actionneur, et une partie arrière interne au carter du moteur. La partie avant est guidée en rotation par deux roulements à contacts obliques, bloqués axialement entre un épaulement de la partie avant de l'arbre et la partie arrière de l'arbre. Cette dernière est guidée en rotation par un roulement arrière. Un frein agit sur la partie arrière de l'arbre. Un joint à lèvre est disposé à l'intérieur du moteur, étant porté par un flasque avant qui maintient également les roulements à contacts obliques. Ce joint à lèvre s'applique sur la partie arrière de l'arbre. Un joint racleur est présent à l'avant du moteur, et définit avec le joint à lèvre un espace contenant un lubrifiant des roulements avant.The Applicant has proposed, in the past, an electric motor whose shaft is made in two parts assembled with each other by screwing, namely a front portion on which is formed an external helical thread which cooperates with a wheel toothed to realize the actuator, and a rear portion internal to the motor housing. The front portion is guided in rotation by two angular contact bearings axially locked between a shoulder of the front portion of the shaft and the rear portion of the shaft. The latter is guided in rotation by a rear bearing. A brake acts on the rear part of the tree. A lip seal is disposed within the engine, being carried by a forward flange which also holds the angular contact bearings. This lip seal is applied to the rear part of the shaft. A wiper seal is present at the front of the engine, and defines with the lip seal a space containing a lubricant of the front bearings.

La demande de brevet EP 1 437 819 décrit un moteur électrique comportant un arbre monolithique et des aimants permanents tournant avec l'arbre et interagissant mécaniquement avec un stator.The patent application EP 1 437 819 discloses an electric motor having a monolithic shaft and permanent magnets rotating with the shaft and mechanically interacting with a stator.

Il existe un besoin pour perfectionner encore les moteurs destinés notamment à la réalisation d'actionneurs, en particulier pour améliorer leur compacité, leur précision et leur fiabilité.There is a need to further improve engines intended in particular for the production of actuators, in particular to improve their compactness, accuracy and reliability.

L'invention a ainsi pour objet un moteur électrique, comportant :

  • un rotor comportant un arbre présentant un épaulement,
  • au moins un roulement avant de guidage de l'arbre,
  • au moins un roulement arrière de guidage de l'arbre,
  • des aimants permanents tournant avec l'arbre et interagissant mécaniquement avec un stator,
caractérisé par le fait que l'arbre est monolithique et le ou les roulements avant sont bloqués axialement contre l'épaulement par un écrou vissé sur l'arbre, l'arbre présentant une portion filetée en prise avec l'écrou, cette portion filetée s'étendant en arrière du ou des roulements avant, du côté arrière du stator.The invention thus relates to an electric motor, comprising:
  • a rotor having a shaft having a shoulder,
  • at least one bearing before guiding the shaft,
  • at least one rear bearing for guiding the shaft,
  • permanent magnets rotating with the shaft and interacting mechanically with a stator,
characterized in that the shaft is monolithic and the or the front bearings are locked axially against the shoulder by a nut screwed onto the shaft, the shaft having a threaded portion engaged with the nut, this threaded portion s extending behind the at least one forward bearing, on the rear side of the stator.

De préférence, les aimants sont portés par l'écrou.Preferably, the magnets are carried by the nut.

Par « monolithique », il faut comprendre que l'arbre est usiné d'un seul bloc.By "monolithic", we must understand that the tree is machined in one block.

De préférence, l'écrou vient en prise sur une partie interne filetée de l'arbre, qui est située du côté arrière du stator, ce qui permet en vissant l'écrou d'exercer une contrainte de traction sur l'arbre sur une portion de celui-ci de longueur relativement importante, s'étendant de l'épaulement précité jusqu'à l'arrière du stator. Dans la solution connue détaillée ci-dessus, la portion d'arbre sous traction est cantonnée à celle au contact des roulements avant. Une plus grande longueur d'arbre sous traction permet de rigidifier celui-ci sur une distance plus importante, et donc d'améliorer encore les performances du moteur et en particulier la précision d'alignement et de rotation, et de supprimer le risque de desserrage de l'écrou.Preferably, the nut engages a threaded internal portion of the shaft, which is located on the rear side of the stator, which allows the nut to be applied to exert a tensile stress on the shaft on a portion of relatively long length, extending from the aforementioned shoulder to the rear of the stator. In the known solution detailed above, the shaft portion under traction is confined to that in contact with the front bearings. A longer shaft length under tension makes it possible to stiffen the latter over a greater distance, and thus to further improve the engine performance and in particular the alignment and rotation accuracy, and to eliminate the risk of loosening. of the nut.

La partie filetée ci-dessus s'étend préférentiellement, selon l'axe de l'arbre, à partir d'une extrémité avant positionnée au niveau de la moitié arrière du stator. La partie filetée se prolonge axialement avantageusement en arrière du stator.The threaded portion above preferably extends, along the axis of the shaft, from a front end positioned at the rear half of the stator. The threaded portion extends axially advantageously behind the stator.

Le moteur peut comporter deux roulements de guidage avant, entre l'épaulement et l'écrou. Ce ou ces roulements avant peuvent chacun être à contacts obliques, le ou les roulements avant étant de préférence étanches et graissés. L'utilisation de roulements étanches et graissés permet d'éviter l'utilisation d'un joint à lèvre en arrière du ou des roulements avant, et d'éliminer les frottements correspondants.The engine may have two front guide bearings between the shoulder and the nut. This or these front bearings may each be in oblique contact, the front bearing or bearings being preferably sealed and greased. The use of sealed and greased bearings makes it possible to avoid the use of a lip seal behind the at least one front bearing, and to eliminate the corresponding friction.

De plus, cela peut permettre de réaliser l'écrou avec une épaisseur qui correspond sensiblement à celle de la bague radialement interne du roulement avant à son contact, notamment avec une épaisseur égale à celle de la bague à ± 20 %. Une pression de contact trop forte contre cette bague radialement interne est ainsi évitée.In addition, this can make it possible to make the nut with a thickness which corresponds substantially to that of the radially inner ring of the front bearing in contact with it, in particular with a thickness equal to that of the ring at ± 20%. Too strong contact pressure against this radially inner ring is thus avoided.

Le moteur électrique peut comporter un carter monobloc qui loge le stator et un frein, ce carter étant de préférence cylindrique de révolution. Le flasque avant peut être rapporté sur ce carter, de même qu'un flasque arrière qui supporte le roulement arrière.The electric motor may comprise a monobloc housing which houses the stator and a brake, this housing being preferably cylindrical of revolution. The front flange can be attached to this housing, as well as a rear flange that supports the rear bearing.

Le stator comporte de préférence une pièce en matière thermoplastique injectée, servant de support à au moins un capteur thermique.The stator preferably comprises a piece of injected thermoplastic material, serving as a support for at least one thermal sensor.

Cette pièce de support peut être agencée pour coiffer les têtes de bobines du stator à une extrémité, de préférence son extrémité arrière.This support piece may be arranged to cap the coil heads of the stator at one end, preferably its rear end.

La pièce de support présente de préférence une forme annulaire, avec des jupes tubulaires radialement interne et externe concentriques, reliées par une paroi intermédiaire ajourée, dont les ajours permettent le passage des fils du ou des capteurs et laisse passer une résine d'enrobage du stator.The support member preferably has an annular shape, with concentrically radially inner and outer tubular skirts, connected by an intermediate wall. perforated, the openings allow the passage of the son or sensors and passes a coating resin of the stator.

Le stator peut comporter des isolants d'extrémité derrière lesquels se glisse la jupe radialement interne, lors du montage de la pièce de support dans le carter du moteur.The stator may include end insulators behind which the radially inner skirt slides, when mounting the support part in the motor housing.

La pièce de support comporte au moins une patte de maintien du capteur, moulée avec l'une au moins de la paroi intermédiaire et des jupes interne et externe. Cette patte peut être élastiquement déformable, de façon à exercer une légère pression sur le capteur en attente d'enrobage par la résine du stator. Le capteur est de préférence un thermocouple.The support member comprises at least one sensor holding tab, molded with at least one of the intermediate wall and the inner and outer skirts. This tab can be elastically deformable, so as to exert a slight pressure on the sensor waiting for coating by the resin of the stator. The sensor is preferably a thermocouple.

L'arbre peut être réalisé avec un filet hélicoïdal externe.The shaft can be made with an external helical thread.

L'arbre peut présenter un diamètre sensiblement constant entre l'épaulement qui sert de butée au(x) roulement(s) avant et la portion filetée sur laquelle l'écrou vient en prise.The shaft may have a substantially constant diameter between the shoulder which serves to abut the (x) bearing (s) before and the threaded portion on which the nut engages.

L'invention pourra être mieux comprise à la lecture de la description détaillée qui va suivre, d'exemples de mise en oeuvre non limitatifs de celle-ci, et à l'examen du dessin annexé, sur lequel :

  • la figure 1 est une coupe longitudinale, schématique et partielle, d'un moteur réalisé conformément à l'invention,
  • la figure 2 représente isolément la pièce de support du capteur thermique, et
  • les figures 3 à 5 sont des vues analogues à la figure 1, de variantes de réalisation du moteur.
The invention will be better understood on reading the following detailed description, non-limiting examples of implementation thereof, and on examining the appended drawing, in which:
  • the figure 1 is a longitudinal section, schematic and partial, of a motor produced according to the invention,
  • the figure 2 represents in isolation the support part of the thermal sensor, and
  • the Figures 3 to 5 are similar views to the figure 1 , variants of the motor.

Le moteur 1 selon l'invention, représenté sur la figure 1, comporte un arbre 2 tournant autour d'un axe X.The engine 1 according to the invention, represented on the figure 1 , has a shaft 2 rotating about an axis X.

L'arbre 2 est de préférence métallique et usiné d'un seul bloc, en acier par exemple.The shaft 2 is preferably metal and machined from a single block, steel for example.

L'arbre 2 présente extérieurement un moyen d'entraînement, tel que par exemple, comme illustré, un filet hélicoïdal externe 3, lequel peut venir en prise avec une roue dentée non représentée, le moteur 1 appartenant par exemple à un actionneur d'un bras robotisé.The shaft 2 externally has a drive means, such as for example, as illustrated, an external helical thread 3, which can engage with a toothed wheel not shown, the motor 1 belonging for example to an actuator of a robotic arm.

Le filet hélicoïdal 3 peut avoir été usiné dans la masse, comme illustré.The helical thread 3 may have been machined in the mass, as illustrated.

L'arbre 2 est guidé dans sa rotation, à l'avant, par deux roulements 4, de préférence à contacts obliques, comme illustré, disposés l'un derrière l'autre, et à l'arrière par un roulement arrière 5.The shaft 2 is guided in its rotation, at the front, by two bearings 4, preferably with oblique contacts, as illustrated, arranged one behind the other, and at the rear by a rear bearing 5.

Les roulements 4 et 5 sont connus en eux-mêmes, et sont étanches et graissés, comportant des disques d'étanchéité 6 qui confinent le lubrifiant entre les bagues au contact desquelles les éléments roulants 7 se déplacent.The bearings 4 and 5 are known in themselves, and are sealed and greased, having sealing discs 6 which contain the lubricant between the rings in contact with which the rolling elements 7 move.

Les roulements avant 4 sont portés par un flasque avant 10 qui loge également un joint racleur 11 s'appliquant sur l'arbre 2.The front bearings 4 are carried by a front flange 10 which also houses a scraper seal 11 applying on the shaft 2.

Les bagues radialement externes 13 des roulements avant 4 sont bloquées axialement sur le flasque entre une paroi frontale de celui-ci et par un circlip 12. Les bagues radialement internes 79 sont bloquées axialement vers l'avant par un épaulement 16 de l'arbre 2.The radially outer rings 13 of the front bearings 4 are locked axially on the flange between a front wall thereof and by a circlip 12. The radially inner rings 79 are locked axially forwardly by a shoulder 16 of the shaft 2 .

Le flasque 10 est assemblé à un carter 14, cylindrique d'axe X, qui loge un stator 15 et un frein 16 à manque de courant, connu en lui-même, comportant une armature mobile 17, rappelée en position de freinage contre une garniture de frein d'un disque de frein par un ou plusieurs ressorts non représentés. Un solénoïde 27 éloigne, lorsqu'alimenté, l'armature 17 de la garniture de frein 26, contre l'action du ou des ressorts.The flange 10 is assembled to a casing 14, cylindrical axis X, which houses a stator 15 and a brake 16 lack of current, known in itself, having a movable armature 17, recalled in the braking position against a gasket brake of a brake disc by one or more springs not shown. A solenoid 27 removes, when fed, the frame 17 of the brake lining 26 against the action of the spring or springs.

Le carter 14 est fermé à l'arrière par un flasque arrière 18 qui porte le roulement arrière 5, et sur lequel peut être fixé, comme illustré, un codeur 19 connu en lui-même, ce codeur comportant une partie fixe 20 fixée à l'aide de vis 21 sur le flasque 18 et une partie mobile fixée sur l'arbre 2 à l'aide d'une vis 22.The housing 14 is closed at the rear by a rear flange 18 which carries the rear bearing 5, and on which can be fixed, as illustrated, an encoder 19 known in itself, this encoder comprising a fixed portion 20 fixed to the screw aid 21 on the flange 18 and a movable part fixed on the shaft 2 by means of a screw 22.

Le rotor comporte des aimants permanents 25 qui interagissent magnétiquement avec le stator 15, de façon à générer le couple moteur.The rotor comprises permanent magnets 25 which interact magnetically with the stator 15, so as to generate the motor torque.

Ces aimants 25 sont portés dans l'exemple considéré par un écrou 30 qui est vissé sur une portion filetée 32 de l'arbre 2.These magnets 25 are carried in the example in question by a nut 30 which is screwed onto a threaded portion 32 of the shaft 2.

La portion filetée 32 se situe du côté arrière du stator 15, et s'étend par exemple, comme illustré, axialement selon l'axe X à partir d'une extrémité avant 32a située au niveau de la moitié arrière 15a du stator 15. Une extrémité arrière 32b de la portion filetée est située en arrière du stator 15. Ce dernier est de longueur L.The threaded portion 32 is located on the rear side of the stator 15, and extends for example, as illustrated, axially along the X axis from a front end 32a located at the rear half 15a of the stator 15. rear end 32b of the threaded portion is located behind the stator 15. The latter is of length L.

L'extrémité avant 32a peut être située sensiblement au niveau d'un épaulement 48 de l'écrou 30, contre lequel les aimants 25 viennent en appui par leur extrémité arrière.The front end 32a may be located substantially at a shoulder 48 of the nut 30, against which the magnets 25 abut by their rear end.

Le disque de frein 26 est porté par un moyeu 53 qui vient en appui par son extrémité avant 53a contre l'extrémité arrière de l'écrou 30 et par son extrémité arrière 53b contre la bague radialement interne 38 du roulement arrière 5.The brake disc 26 is carried by a hub 53 which bears at its front end 53a against the rear end of the nut 30 and at its rear end 53b against the radially inner ring 38 of the rear bearing 5.

Une rondelle 39, élastiquement déformable, de précharge du roulement arrière 5, s'interpose axialement entre le roulement arrière 5 et le flasque arrière 18. Ainsi, en cas de dilatation thermique et d'allongement de l'arbre 2, le roulement arrière 5 peut reculer vers le flasque arrière 18, l'arbre étant sans jeu axial par rapport au flasque avant 10 du fait de la présente des roulements avant 4 à contacts obliques.A washer 39, elastically deformable, preload rear bearing 5, is interposed axially between the rear bearing 5 and the rear flange 18. Thus, in case of thermal expansion and elongation of the shaft 2, the rear bearing 5 can move back towards the rear flange 18, the shaft being without axial clearance with respect to the front flange 10 due to the presence of the front bearings 4 with oblique contacts.

L'écrou 30 vient en appui axialement, à l'avant, par une extrémité 35, contre la bague radialement interne 79 du deuxième roulement avant 4.The nut 30 abuts axially, at the front, by one end 35, against the radially inner ring 79 of the second front bearing 4.

Ainsi, en vissant l'écrou 30 sur l'arbre 2 grâce à la portion filetée 32, on peut exercer une contrainte axiale sur les roulements avant 4 pour les bloquer axialement contre l'épaulement 16 de l'arbre 2. Cette contrainte axiale s'accompagne, en réaction, d'une traction qui s'exerce sur la portion d'arbre 40 s'étendant axialement entre l'épaulement 16 et la portion filetée 32. Cette traction tend à rigidifier l'arbre.Thus, by screwing the nut 30 on the shaft 2 through the threaded portion 32, it is possible to exert an axial stress on the bearings before 4 to lock them axially against the shoulder 16 of the shaft 2. This axial stress s It accompanies, in reaction, a traction exerted on the shaft portion 40 extending axially between the shoulder 16 and the threaded portion 32. This traction tends to stiffen the shaft.

L'épaisseur ee de l'extrémité de l'écrou 30 qui vient en contact avec la bague 79 est sensiblement la même que celle eb de la bague. On a de préférence ee = eb ± 20 %.The thickness e e of the end of the nut 30 which comes into contact with the ring 79 is substantially the same as that e b of the ring. It preferably has e e b = e ± 20%.

Le stator 15 comporte une pièce de support 60, représenté plus particulièrement à la figure 2, en matière thermoplastique injectée, qui maintient au moins un capteur de température 80 du stator.The stator 15 comprises a support piece 60, represented more particularly in FIG. figure 2 , injected thermoplastic material, which maintains at least one temperature sensor 80 of the stator.

La pièce de support 60 comporte une jupe tubulaire radialement externe 91 et une jupe radialement interne 92, concentriques d'axe X, reliées entre elles par une paroi intermédiaire 93 s'étendant perpendiculairement à l'axe X.The support piece 60 comprises a radially outer tubular skirt 91 and a radially inner skirt 92, concentric with an X axis, interconnected by an intermediate wall 93 extending perpendicularly to the axis X.

La paroi intermédiaire 93 comporte des ajours 94. Une patte 95 de maintien du capteur 80 est moulée avec la paroi intermédiaire 93.The intermediate wall 93 has openings 94. A tab 95 for holding the sensor 80 is molded with the intermediate wall 93.

Le stator 15 comporte des bobines et des isolants d'extrémité non représentés. La jupe interne 92 se place derrière ces isolants d'extrémité, tandis que la jupe externe 91 vient en regard de la surface radialement interne du carter 14. Une résine 96 enrobe le bobinage stator et la pièce de support 60, à la faveur des ajours 94 de celle-ci.The stator 15 comprises unrepresented coils and end insulators. The inner skirt 92 is placed behind these end insulators, while the outer skirt 91 faces the radially inner surface of the casing 14. A resin 96 coats the stator winding and the support piece 60, in favor of the openings. 94 of this one.

L'écrou 30 présente des trous borgnes de serrage 50, à son extrémité arrière.The nut 30 has blind holes 50 at its rear end.

On a représenté aux figures 3 à 5 des variantes de réalisation du moteur selon l'invention.Representatives Figures 3 to 5 embodiments of the engine according to the invention.

La variante de la figure 3 diffère de celle de la figure 1 par le fait que l'écrou 30 ne porte plus les aimants 25, ceux-ci étant portés par un moyeu 110 rapporté sur l'arbre 2. La partie filetée 32 s'étend entre le deuxième roulement avant 4 et le stator 15.The variant of the figure 3 differs from that of figure 1 in that the nut 30 no longer carries the magnets 25, these being carried by a hub 110 attached to the shaft 2. The threaded portion 32 extends between the second front bearing 4 and the stator 15.

Dans la variante de la figure 4, l'épaulement 16 de l'arbre est tourné vers l'avant et le roulement avant 4 est double.In the variant of the figure 4 , the shoulder 16 of the shaft is turned forward and the front bearing 4 is double.

L'écrou 30 est situé à l'avant du moteur, au niveau d'une ouverture 116 du flasque avant 10. La partie filetée 32 s'étend en avant du roulement avant 4, dans l'ouverture 116. Les aimants 25 sont portés directement par l'arbre 2.The nut 30 is located at the front of the engine, at an opening 116 of the front flange 10. The threaded portion 32 extends forward of the front bearing 4, in the opening 116. The magnets 25 are worn directly by the tree 2.

La variante de la figure 5 diffère de celle de la figure 4 par le fait que le flasque avant 10 se prolonge vers l'avant au-delà de l'écrou 30 et par le fait que le frein n'est plus porté par le carter 14 mais par le flasque arrière 18.The variant of the figure 5 differs from that of figure 4 in that the front flange 10 extends forwardly beyond the nut 30 and in that the brake is no longer carried by the casing 14 but by the rear flange 18.

Bien entendu, l'invention n'est pas limitée aux exemples qui viennent d'être décrits.Of course, the invention is not limited to the examples which have just been described.

En particulier, le ou les roulements avant peuvent être autres que ceux décrits, de même que le roulement arrière.In particular, the front bearing or bearings may be other than those described, as well as the rear bearing.

Claims (11)

  1. Electric motor (1) comprising:
    - a rotor with a shaft (2),
    - at least one front bearing (4) for guiding the shaft,
    - at least one rear bearing (5) for guiding the shaft,
    - permanent magnets (25) turning with the shaft and mechanically interacting with a stator,
    characterised in that the shaft (2) is monolithic and has a shoulder (16), and the front bearing(s) (4) are axially blocked against the shoulder (16) by a nut (30) screwed onto the shaft (2), the shaft having a threaded portion (32) in engagement with the nut (30), this threaded portion (32) extending behind the front bearing(s) (4) on the rear side of the stator.
  2. Motor according to claim 1, wherein the magnets (25) are carried by the nut (30).
  3. Motor according to claim 1 or 2, wherein the threaded portion (32) has a front end (32a) situated at the level of the rear half (15a) of the stator.
  4. Motor according to any of the preceding claims, comprising two front guide bearings (4) between the shoulder (16) and the nut (30).
  5. Motor according to any of the preceding claims, wherein the front bearing(s) (4) are each angular contact bearings.
  6. Motor according to any of the preceding claims, wherein the front bearing(s) (4) are sealed and lubricated.
  7. Electric motor according to any of the preceding claims, comprising a monobloc housing (14) which accommodates the stator (15) and a brake (16), wherein said housing (14) is preferably cylindrical in revolution.
  8. Motor according to any of the preceding claims, wherein the stator (15) comprises a part (60) made of injected thermoplastic material serving as support for a thermal sensor (80).
  9. Motor according to the preceding claim, wherein the support piece (60) comprises radially inner (92) and outer (91) concentric skirts connected together by a perforated intermediate wall (93).
  10. Motor according to claim 8 or 9, wherein the support piece (60) comprises a tab (95) holding the sensor (80).
  11. Motor according to any of the preceding claims, wherein the shaft (2) is produced with an external helicoidal thread (3).
EP14176623.8A 2013-07-12 2014-07-10 Electric motor Active EP2824366B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1356911A FR3008563B1 (en) 2013-07-12 2013-07-12 ELECTRIC MOTOR

Publications (2)

Publication Number Publication Date
EP2824366A1 EP2824366A1 (en) 2015-01-14
EP2824366B1 true EP2824366B1 (en) 2018-10-31

Family

ID=49713161

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14176623.8A Active EP2824366B1 (en) 2013-07-12 2014-07-10 Electric motor

Country Status (3)

Country Link
EP (1) EP2824366B1 (en)
DK (1) DK2824366T3 (en)
FR (1) FR3008563B1 (en)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2688520A (en) * 1950-09-11 1954-09-07 Union Oil Co Pressure seal for rotating shafts
ATE413714T1 (en) * 2003-01-10 2008-11-15 Askoll Holding Srl PERMANENT MAGNET MOTOR FOR CIRCULATION PUMPS OF HEATING AND AIR CONDITIONING SYSTEMS

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
FR3008563B1 (en) 2015-08-21
DK2824366T3 (en) 2019-02-25
EP2824366A1 (en) 2015-01-14
FR3008563A1 (en) 2015-01-16

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